Control circuit for microwave ovens

摘要

A microcomputer (202) detects when a key entry is made and then counts the number of pulses in a preset time. If the number is correct a discrimination signal (DR) is sent to a test signal generator (204) and to a control unit (206). The test signal generator also receives the key signal and produces a test signal (CS) which is sent to the control unit (206). The control unit (206) logically processes the test signal (CS) and the discrimination signal (DR) from the microcomputer and sends a signal (DC) to a relay (208) which controls the microwave magnetron.